Hi
can i get confidence intervals for each cell in a "r x c table" (based on row percent)
I have used the riskfdiff option in a 2x2 table ; but obviously this does not work on 3x2 table
data 2x2;
input Shop $ Low Total;
Outcome="2.High"; Count=Total-Low ; output;
Outcome="1.Low"; Count=Low ; output;
datalines;
Shop1 7000 15275
Shop2 2500 7500
;
proc print data=2x2;
var Shop Outcome Count;
run;
proc freq data=2x2 order=formatted;
weight Count;
table Shop * Outcome / nopercent nocol chisq riskdiff;
run;
/******************/
data 3x2;
input Shop $ Low Total;
Outcome="2.High"; Count=Total-Low ; output;
Outcome="1.Low"; Count=Low ; output;
datalines;
Shop1 7000 15275
Shop2 2500 7500
Shop3 1850 5250
;
proc print data=3x2;
var Shop Outcome Count;
run;
proc freq data=3x2order=formatted;
weight Count;
table Shop * Outcome / nopercent nocol chisq ;
run;
I've worked it out using an online calculator but can;t replicate in SAS - i would really appreciate any guidance
many thanks
L
As far as I know, you can only get confidence intervals of the percent in each cell using PROC FREQ if you have a one-way table.
So, you could probably turn your rxc table into a one-way table with rxc categories, and get the confidence intervals that way.
thanks for the reply Paige - I will look into your suggestion
best wishes
Lorraine
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